If you are the developer of the app and can reproduce the problem on your device, please follow these steps.
Connect your iPhone, iPad, or iPod touch to your Mac
Open Xcode, then go to Window > Devices
Select your device in the left sidebar
Open the device log by clicking on the little triangle at the bottom of the window
5. Start the installation of your app
During the installation, you should see one or more warning or error message. If you need help with those messages, please store the log into a .txt file and send it to us.